Fix is_constexpr_default_constructible under clang-10
Summary: [Folly] Fix `is_constexpr_default_constructible` under clang-10, which suffers a crash (https://bugs.llvm.org/show_bug.cgi?id=47620) and divergent behavior in certain constexpr evaluations. Reviewed By: mpark, Mizuchi Differential Revision: D24302661 fbshipit-source-id: b6a58b5b675f367bf2dc1d810edb9926cfb87a2e
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